Speedometer.



SPEEDOMETER! AFPLICATIUN FIL ED SEPI. I8 |916.

1,21 1.5253.l Patented Ja 1 12,1917.'

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L 1MM@ l 4 TTORNEYS 'MARVIN .SMITHEY, OF LAWRENCEYILLE. VIRGINIA.

sPEnDoMETEn.

Specification of Letters Patent.

Patented Jan. 2, 1917.

v' Application led September 18, 1916. Serial No. 120,825.

To all 'whom it may concern:

'13e it known that I, MARVIN SMITHEY, a citlzen of the United States, and a resident of Lawrenceville,l in the countyv of Brunswick and State of Virginia, have invented a certain new and useful Improvement in Speedometers, of which the following is a specification.

My invention relates to speedometers, and it consists in the combinations, constructions, and arrangements herein described and claimed. 4 l

An object of my invention is to provide a speedometer which works on the centrifugal principle, but which has few parts and which, therefore, is not easily liable to get out of order.

A further object of my invention is to provide a speedometer which is relatively compact in form. v

A further object of my invention is to provide a speedometer which responds readily to variations in speed and which accurately registers such variations.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out inthe appended claims.

My invention is illustrated in the accompanying drawings forming part of this application, in which:

LFigure lis 'a view partly in section; Fig. 2 is a sectional view at right angles to Fig. 1, and Fig. 3 is a perspective view of one of the operatingparts. l In carrying out my invention,'I make use of a housing A, see Figs. 1 and 2, for the centrifugal member' which operates the speedometer.

The speedometer comprises the shaft 2 upon which is mounted a centrifugal wheel 1, the pivot 1c of the wheel extending at f ri ht angles to the axis ofthe shaft 2.

e portion of the shaft 2 upon which the wheel is mounted is enlarged as shown at 2", and on each side Aof this portion and surrounding the shaft 2, are and 4 respectively. The spring 3 bears against a slidable collar 5 which has a link 6 which springs 3 and 4 tend to keepthe collars 5 and 7 far apart. l As the shaft 2 is rotated, the

centrifugal force exerted by the wheeltends to pull the collars toward the pivotal point of the wheel against the tension y of theA springs 3 and 4.

Carried by the collar 7 is an adjustable vscrew 9, whoseinner end extends through 'a slot 10 vin the hollow portion 11 of the shaft 2. y

Slidably disposed inthe hollow portio 11 is a plunger having a grooved head ,12, and a guide member 13.r The end of the screw 9 is disposed in the groove in the head l12, so that the shaft 2 may be rotated without rotating the plunger 12. Any longitudinal movement of the screw 9 along the shaft 2, however, will cause a movement of the plunger 12.

Extending from the guide member 13 an arm 14 which is` bent laterally as shown in Fig. 3, the end of this .arm bearing a pin 15 arranged to extendI through la cam slot 16 in an extension 17 of a sleeve 18 to which a bevel gear 19 is secured. The bevel gear 19 in turn meshes with a bevel gear 2O on the hub 21 of la number wheel 22, this number wheel being observed through a Window 23.

When the shaft 2 is stationary, the wheel '1 occupies the position shown in Figf3, but

when the shaft 2 is'in motion the rotation of the shaft will cause the wheel lto assume a position more nearly at right angles to the axis :of the shaft 2. This will cause the collars 5 and 7 to approach one another. The movement of the collar 7 will cause the movement of the plunger 12 in the hollow portion ofthe shaft, thus moving the arm 14. The slot 16 is so formed that the movement of thepin 15 along the slot will cause thel revolution of the wheel 22 a distance proportional to the speed of lrevolution of the shaft 2. The form vof the cam slot 16 is, of course, found -by experiment.

1. A speedometer comprising a drive shaft, a. centrifu 'l member pivotally mounted von said drive shaft, a slidable collar mounted on said drive shaft, means pivotally connecting said collar with said centrifugal member, a spring for opposing the movement of the collar, a number wheel, a-

movable member hav' a cam groove,

means for connecting sai movable membeig/` with said number wheel and. for rotating-tbe said number wheel being provided with a mounted on said drive shaft, a slidable collar mounted on said drive shaft, means pivotally connecting said collar with said centrifugal member, a spring for opposing the movement of the, collar, a number wheel,

v hub bavinga bevel gear, a secondbevel gear arranged to mesh with the first named bevel gear, a sleeve for supporting said bevel. gear, anextension through said sleeve provided with a cam groove, a rigid connection having engagement with the collar at one end, and being provided with a-pin at the other end arranged to traverse the cani groove.

3. A speedometer comprising a drive shaft, one end of said drive shaft 4being hollow, a centrifugal member pivotally mounted on said drive shaft, a slidable collar 'carried by the hollow end of the drive shaft, means pivotally connecting said collar with said centrifugal member, a spring for opposing the movement of the collar, said shaft being provided with a longitudinal slot, a screw carried `by said collar and arranged rto extend through said slot, a plunger having a grooved head disposed within said hollow shaft, the end of the screw entering the grooved head of the plunger, the opposite end of the plunger being provided with a laterally extending arm, a pin carried by the arm, a sleeve mounted for rotation and having a lbevel gear secured thereto at one end, anextension carried by the sleeve at the opposite end and being provided with a cam groove arranged to receive the pin on said arm, a number wheel mounted for rotation around its axis, and a bevel gear carried by the number wheel and arranged to be engaged by the first named bevel gear.v

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